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87 F150 Fuel pump problems

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Old 12-26-2008, 11:39 PM   #1
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Default 87 F150 Fuel pump problems

The fuel pumps will not turn on. I have replaced the following items:
front tank fuel pump
HP fuel pump (on the frame)
fuel pump relay
EEC relay

There is 12v to the fuel pump relay & EEC relay as the wiring diagram indicates.
at the other terminals on the EEC relay I measure about 2.75 volts with the key on.

The Inertia switch & the fuel tank switch show continuity when tested.

What else should I check for? Someone mentioned the Throttle Position Sensor, would that keep the pumps from running?

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Old 12-27-2008, 02:25 AM   #2
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Check the computer for codes, this thread will explain how:
Sounds like there may be a computer issue. The TPS won't keep the pumps from running.
Originally Posted by Early Cuyler
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Old 03-11-2013, 09:17 AM   #3
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check the fuseable link by the eec relay, theres a brown wire that comes out if it and goes to a little round plastic box about a inch or so away then goes into a red wire, in that box there is a splice and it becomes corroded and wont complete the circut for the fuel pump relay, they had alot of wiring problems to do with these relays, espetialy if the truck sits alot
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Old 03-11-2013, 12:14 PM   #4
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Did you put a ground on the vip test connector? After you do that, check for volts at the pump connector, while your there check for ground. Let us know what you come up with.
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Last edited by 5Rangers; 03-11-2013 at 12:17 PM.
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Old 03-11-2013, 12:14 PM

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